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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2165-2170 
    ISSN: 0009-2940
    Keywords: Titanocene complexes ; Zirconocene complexes ; Cyclopropene complexes ; Metallacyclobutenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metallacyclobutenes via η2-Cyclopropene Complexes of Titanocene and Zirconocene(η2-Cyclopropene)(trimethylposphane) complexes of titanocene (4, 5) and zirconocene (8) are obtained in good yields by the reaction of 1,2-diphenylcyclopropene (2) or 4,8-dioxaspiro[2.5]oct-1-ene (3) with bis(trimethylphosphane)titanocene (1) and (1-butene)(trimethylphosphane)zirconocene (7), respectively. In solution the new complexes 4 and 8 rearrange smoothly above room temperature to give the metallacyclobutene derivatives 6 and 9. All new compounds were characterized by spectroscopic methods (31P, 1H, 13C NMR), and the crystal structure of 9 was determined by an X-ray analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1035-1042 
    ISSN: 0009-2940
    Keywords: Zirconocene(1-alkene) complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1-Alkene)trimethylphosphine)zirconocenes: Preparation, Characterization, and Reactivity(1-Butene)(trimethylphosphine)zirconocene (1) is prepared in 83% yield by subsequent reaction of zirconocene dichloride with two equivalents of n-butyllithium and trimethylphosphine. Reaction of complex 1 with other alkenes or alkynes, e.g. ethylene, styrene, or tolane indicates that this compound is an ideal starting material for synthezising other (alkene)- or (alkyne)zirconocene complexes, e.g. 2, 3, or 7. Another route to (1-alkene)(trimethylphosphine)zirconocenes, e.g. the 1-propene complex 9 or the 1-pentene complex 10, is the reaction of zirconocene dichloride with 1-alkylmagnesium halide in the presence of trimethylphosphine at room temperature. Spectroscopic investigations 1H-, 13C-, and 31P-NMR spectroscopy) confirm that in solution, complex 1 as well as the other 1-alkene complexes 3, 9, and 10 exist as a mixture of two rotamers 1a, b, 3a, b, 9a, b, and 10a, b in a ca. 4:1 ratio. The structures of the ethylene complex 2 and the styrene complex 3a are also determined by X-ray analyses.
    Notes: Die Reaktion des Zirconocendichlorids mit zwei Äquivalenten n-Butyllithium und Trimethylphosphan liefert (1-Buten)(trimethylphosphan)zirconocen (1) in 83 proz. Ausbeute. Komplex 1 ist ein ausgezeichnetes Ausgansmaterial zur Darstellung weiterer (Alken)- oder (Alkin)zirconocen-Komplexe; so erhält man durch Verdrängung des 1-Butens mit Ethylen, Styrol oder Tolan die Zirconocen-Komplexe 2, 3 oder 7 in hohen Ausbeuten. Eine weitere Darstellungsmethode für (1-Alken)(trimethylphosphan)zirconocen-Komplexe ist die Umsetzung von Zirconocendichlorid mit 1-Alkylmagnesiumhalogeniden in Gegenwart von Trimethylphosphan bei Raumtemperatur; z. B. sind so der 1-Propen-Komplex 9 und der 1-Penten-Komplex 10 gut zugänglich. Spektroskopische Untersuchungen (1H-, 13C- und 31P-NMR) zeigen, daß alle dargestellten (1-Alken)(trimethylphosphan)zirconocen-Komplexe in Lösung bei 0°C als getrennt beobachtbare Rotamerenpaare 1a, b, 3a, b, 9a, b und 10a, b im Verhältnis ca. 4:1 vorliegen. Die Strukturen des Ethylen-Komplexes 2 und des Styrol-Komplexes 3a wurden zusätzlich durch Kristallstrukturanalysen ermittelt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Titanocene complexes ; Cyclopropane, methylene, complexes ; Bis(titanocenyl)acetylene complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of a New Bis[(trimethylphosphan)titanocene] Complex with a Bridging C2 Unit
    Notes: Bis(trimethylphosphane)titanocene (1) reacts with 2-methylene-1,1-diphenylcyclopropane (2) to give red crystalline (η2-2-methylene-1,1-diphenylcyclopropane)(trimethylphosphane)titanocene (3). In solution complex 3 degrades smoothly to form the new Cp2Ti(PMe3) - C2 - Ti(PMe3)Cp2 complex 4, the crystal structure of which has been elucidated by an X-ray analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1541-1550 
    ISSN: 0009-2940
    Keywords: Titanocene complexes ; Zirconocene complexes ; Metallabicyclo[3.1.0]hexenes ; 4-Vinyl-1-metallacyclobutenes ; Oxidative coupling of alkynes with cyclopropenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metallabicyclo[3.1.0]hexenes and Their Rearrangement to Vinylmetallacyclobutenes (M=Ti, Zr)Alkyne-metallocene complexes, e.g. the alkynetitanocenes 1a, b, the alkyne(trimethylphosphane)titanocenes 2a, b and the alkyne(trimethylphosphane)zirconocenes 5a-d react readily with 3,3-dimethylcyclopropene (3a) and 3,3-diphenylcyclopropene (3b) to give the corresponding bis(η5-cyclopentadienyl)-metallabicyclo[3.1.0]hexene derivatives 4a-e, (M=Ti) and 6a-g (M=Zr) in high yields. In an analogous manner, metallabicyclo[3.1.0]hexene derivatives of Ti or Zr can be prepared from 1,2-diphenylcyclopropene(trimethylphosphane)metallocenes 9 and 10 and 2-butyne to yield 11 and 12 and from benzyne 3a or 3b to yield 8a and 8b. Some of these metallabicyclo[3.1.0]hexene derivatives rearrange quantitatively to the corresponding 4-(dimethylvinyl)-1-metalla-2-cyclobutene derivates 16 and 17a and 4-(diphenylvinyl)-1-metalla-2-cyclobutenes 15c and 17a-c when they are heated to 60-80°C for several hours. The 4-(diphenylvinyl)-1-titana-2-cyclobutene derivatives 15a-c can also be obtained by reaction of [(2,2-diphenylvinyl)carbene](trimethylphosphane)-titanocen (13) with disubstituted alkynes such as tolane, phenyltrimethylsilylacetylene and bis(trimethylsily)acetylene. With other alkynes, e.g. 2-butyne, 1-butyne, 1-propyne or acetylene, 13 reacts by polymerization of these alkynes; the corresponding 4-vinyl-1-titanacyclobutene derivatives could not be detected in the reaction mixture. All new metallacycles are fully characterized by spectroscopic methods, extensive 1H- and 13C-NMR studies provide unambiguous proof of their structures.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 101 (1989), S. 647-648 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 29 (1990), S. 1037-1038 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 28 (1989), S. 610-611 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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